people always talk about evil clones like oooh a dark mirror oohh what if you saw what a cruel person you were/are capable of becoming. and well yes but what if you were the evil clone. what if you looked in the mirror and what you saw was so bright it blinded you. what if you had to know exactly how good you could have been.
Powers Rangers comics, of all things, has done this. Shattered Grid comics storyline had this idea at its core. Lord Drakon, a version of Tommy Oliver/the Green Ranger that actually chose to rejoin Rita after being freed from the mond control spell, started looking into the multiverse and seeing every other Tommy out there was a beloved and respected hero while he alone was a reviled tyrant and murderer.
His response was to come up with a plan to make himself omnipotent and rewrite the multiverse into just one world with himself as the only hero.